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Seasonal Hydrological Modulation of Creep and Seismicity

Seasonal Hydrological Modulation of Creep and Seismicity. Yingdi LUO 02/15/2012 Ge169/277. Chihshang Fault: 35km long Reverse fault 20-30 mm/ yr. 2003 Chengkung EQ. Creep: Chihshang Fault in T aiwan. Chang et al. 2009. Chihshang Fault in Taiwan: Water Level vs. Creep. Well A. Average.

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Seasonal Hydrological Modulation of Creep and Seismicity

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  1. Seasonal Hydrological Modulation of Creep and Seismicity Yingdi LUO 02/15/2012 Ge169/277

  2. Chihshang Fault: 35km long Reverse fault 20-30 mm/yr 2003 Chengkung EQ. Creep: Chihshang Fault in Taiwan Chang et al. 2009

  3. Chihshang Fault in Taiwan: Water Level vs. Creep Well A Average Well B 5X creep rate 2003 Chengkung EQ. 15mm/yr Chang et al. 2009

  4. Well A Average ground water level Well B Water table (estimated) De-trended shortening Chihshang Fault in Taiwan:Water Level / Rainfall /Seismicity 50 day lag: Rising water table Increased Rainfall Rainfall Chang et al. 2009

  5. Seismometers Summit Mt. Hood Stream discharge gauging station Earthquakes Seismicity: Mt. Hood Oregon Saar & Manga 2003

  6. Mt. Hood Oregon Saar & Manga 2003

  7. Mt. Hood Oregon: Stream Discharge Saar & Manga 2003

  8. Mt. Hood Oregon: Stream Discharge Vs. Seismicity Cumulative mean daily stream discharge Cumulative number of earthquakes Cumulative seismic moment Saar & Manga 2003

  9. Cumulative mean daily stream discharge Cumulative number of earthquakes Cumulative seismic moment Mt. Hood Oregon: Stream Discharge Vs. Seismicity Saar & Manga 2003

  10. Interpolated Time Series Mt. Hood Oregon: Stream Discharge Vs. Seismicity Time lag: 151 days Saar & Manga 2003

  11. Cause of Hydrological Modulation of Seismicity and Creep Saar & Manga 2003

  12. Cause of Hydrological Modulation of Seismicity and Creep Saar & Manga 2003

  13. Cause of Hydro-seismicity: Mt. Hood Oregon Periodic pore-fluid pressure variation 1D half-space diffusion equation Hydraulic diffusivity Solution Saar & Manga 2003

  14. Cause of Hydro-seismicity: Mt. Hood Oregon Hydraulic diffusivity Periodic pore-fluid pressure variation 1D half-space diffusion equation Hydraulic conductivity Hydraulic diffusivity Permeability Solution Saar & Manga 2003

  15. Back to Chihshang Fault Hydraulic diffusivity Periodic pore-fluid pressure variation t ~ 50day, z ~ 30m => κ ~ 1.2e-4 m2/s 1D half-space diffusion equation Hydraulic diffusivity Solution Chang et al. 2009

  16. Back to Chihshang Fault Periodic pore-fluid pressure variation Rate-strengthening friction 1D half-space diffusion equation Hydraulic diffusivity Solution Chang et al. 2009

  17. Chang et al. 2009 Simulated fault creep with rate-strengthening

  18. Chang et al. 2009 Simulated fault creep with rate-strengthening

  19. Hydraulic diffusivity κ = 0.05m2/s Simulated fault creep with rate-strengthening Chang et al. 2009

  20. Seismicity: Parkfield, CA Christiansen et al. 2007

  21. Chang, S.H., Wang, W.H. & Lee, J.C., 2009. Modeling temporal variation of surface creep on the Chihshang fault in eastern Taiwan with velocity-strengthening friction, Geophysical Journal International, 176, 601-613. Christiansen, L.B., Hurwitz, S. & Ingebritsen, S.E., 2007. Annual modulation of seismicity along the San Andreas Fault near Parkfield, CA, Geophysical Research Letters, 34. Saar, M.O. & Manga, M., 2003. Seismicity induced by seasonal groundwater recharge at Mt. Hood, Oregon, Earth and Planetary Science Letters, 214, 605-618. References:

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